A) Haemoglobin
B) Lecithin
C) Mucin
D) Casein
Correct Answer: C
Solution :
Glycoproteins are proteins linked to carbohydrate also known as mucoprotein, eg, mucin of saliva. Haemoglobin is a chromoprotein, ie, protein in combination with a prosthetic group that is a pigment. Lecithin is most abundant animal tissue phospholipid. It is an important constituent of lipoprotein (proteins conjugated with lipids). Casein is a phosphoprotein (protein + phosphate). Phosphoproteins are proteins in combination with a phosphate containing radical other than a nucleic acid or a phospholipid.
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